CVE-2025-39748 is a vulnerability in the Linux kernel's BPF verifier, specifically related to how it handles range refinement after JSET instructions, leading to a kernel warning due to an invariant violation. This issue affects Linux kernel versions and has been addressed by forgetting ranges when narrowing tnums after a JSET. With a CVSS score of 5.5 (MEDIUM), it has a local attack vector, low attack complexity, and could lead to high availability impact. There is currently no evidence of active exploitation, public exploit code, or inclusion in CISA's KEV catalog, though it has garnered some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 6.12.43CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.13, < 6.15.11CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.16, < 6.16.2CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
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Feb 24, 2026kernel: bpf: Forget ranges when refining tnum after JSET
Sep 11, 2025bpf: Forget ranges when refining tnum after JSET
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